Nav overflow on 15 inch

I am developing a site:

www.alexisparkinn.com

When I view the site on a laptop with a 15inch screen my nav bar wraps to a new line and I don't know why it is doing this. I can also get this error to happen when I zoom out of a webpage in any browser. I'm confused to why this is happening.

I don't know where to look either, any insight or advice would开发者_运维百科 be greatly appreciated.

Thanks!

I'm guessing this is what you are referring to (viewed in Firefox 4, no zoom):

It looks to me like you're not giving enough space for the amount of links you want, so the <li> just wrap to the next line, breaking your layout. I'd suggest merging a few links or looking into implementing some kind of drop down menu system.

This isn't really a problem with DPI or your screen resolution, as all that scales: your page elements should always be in proportion with each other, even if they're not the same size on different screens.